/*
转义字符

*/


console.log("  'I \'  m \"OK\"!'");

console.log( "ASCII字符 '\x64'");


/*
操作字符
*/

var a = 'hello,word' 

console.log(a[5])   /*打印索引位置的值*/

var b=a.toUpperCase();
console.log(b);   /*全变大写*/

var c = b.toLocaleLowerCase();
console.log(c);   /*全变小写*/
